A later post clarified that this figure is the time it will take you to get to the credits. Fully completing the game may take longer.

Bravely Default's promotions have been heavily tied to its AR features. But this seems to be just a minor part of the game. AR-based content takes up around 1% of the game.

Other posts at the Twitter feed revealed that the game has summons with elaborate visualizations.

Also, the game will probably not get a special 3DS system (special systems are common for major Square Enix releases). The Twitter feed noted that the game's promotions, including demos, have focused on current 3DS owners.